When I decided to update my road bike components several years ago, I decided to change from Shimano 8-speed Dura-Ace to Campagnolo 10-speed Record. Why? Well, it wasn't exactly that well thought-out, since my tri-bike has Shimano components, so I can't swap between them. My cyclocross bike, though, has Campagnolo 10-speed, so it's not completely crazy. Anyway, I put a new chain on my road bike, and cleaned the cassette, derailleurs and crankset prior to putting them on. I took apart the cassette to clean it, remembering that the spacers were not uniform. For some reason, Campagnolo makes spacers that are differentiated. I suppose it makes the shifting better, but I couldn't figure out why. After all, Shimano's cassettes have uniform spacers and their shifting seems to work pretty well. I even pulled out the technical manual that came with the cassette (yes, I keep those things) and looked at it.
So, after cleaning and then reassembling the cassette last night, I ran through the gears to make sure it was shifting cleanly. Every cog shifted smoothly except for the 17. It kept getting hung up and I could not get it to work. I went to bed, figuring that I would work on it in the morning. As I was getting ready to fall asleep, the idea that I had assembled the spacers incorrectly went through my mind. When I woke up this AM, I looked at the schematics of the technical manual, and then took off the cassette. Yup, I had reversed the spacer between the 23-25 and the 19-21. When I switched them, reassembled the cassette, and ran through the cogs, it shifted smoothly, even the 17. Ah-ha! Taking my bike out for a ride today, after having put on a new chain, and cleaned the drivetrain, everything worked smoothly. The shifting in a Campagnolo drivetrain is just more solid than I've found in a Shimano drivetrain, at least between road bikes. The brifters don't rattle, and each shift is a solid "thunk" rather than a "snick" that I've experienced with Shimano.
And maybe that's why there are three different types of spacers in a Campagnolo cassette. But, it just reminds me that it requires just a bit more attention than Shimano. And it reminds me of the reputation of Italian sports cars: they are fantastic to drive, but are much more finicky. But, as I rode my bike today and felt the satisfaction of each positive shift and how the drivetrain hummed along, I understood why people still buy Italian sports cars.
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